Performance of turbo-coded chaotic interleaving and frequency-domain equalization scheme for high speed OFDM-based PLC systems

Abstract In this paper, we propose a turbo coded-chaotic interleaving and frequency-domain equalization scheme for high speed OFDM-based powerline communication (PLC) systems. The proposed scheme is composed of two stages as follows. At stage 1, the chaotic interleaver is introduced to replace the random interleaver usually used in conventional turbo codes. It generates permuted version from the sample sequence to be transmitted with low correlation among their samples, leading to better bit error rate (BER) and security performance. At stage 2, the frequency-domain equalizer uses a new clipping/blanking function to estimate the impulsive noise samples after OFDM demodulation. The proposed method combines the advantages of having excellent error correction capability with low complexity, high security, and efficient impulsive noise cancellation without a prior knowledge about the characteristics of impulsive noise. Computer simulation results reveal that the proposed scheme achieves better BER performance in comparison to the conventional block interleaving. Furthermore, the obtained results show that this scheme with frequency-domain equalization provides a good trade-off between system performance and bandwidth efficiency.

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